为什么我不能在释放资源后删除tif文件？
为什么我不能在释放资源后删除tif文件？
提问于 2022-01-14 02:02:18
我想阅读这个tiff的bbox，完成后我想删除这个tiff，似乎有一个未关闭的流导致tiff不被删除。
public static void main(String[] args) throws Exception {
File file = new File("E:\\test\\1\\昂多.tif");
GeoTiffReader reader = new GeoTiffReader(file);
GridCoverage2D read = reader.read(null);
Envelope2D coverageEnvelope = read.getEnvelope2D();
Rectangle2D bounds2D = coverageEnvelope.getBounds2D();
double[] bbox = {
bounds2D.getMinX(), bounds2D.getMinY(),
bounds2D.getMaxX(), bounds2D.getMaxY()
};
for (double v : bbox) {
System.out.println(v);
}
read.dispose(true);
reader.dispose();
FileUtils.forceDelete(file);
}代码运行结果
98.408460773
30.078745248
98.460743439
30.115231446
Exception in thread "main" java.io.IOException: Unable to delete file: E:\test\1\昂多.tif
at org.apache.commons.io.FileUtils.forceDelete(FileUtils.java:2400)
at cn.gisdata.core.publish.strategyImpl.Test.main(Test.java:37)
Process finished with exit code 1GeoTools GridCoverage2D dispose(布尔力) api doc
public boolean dispose(boolean force)
Provides a hint that a coverage will no longer be accessed from a reference in user space. This method disposes the image only if at least one of the following conditions is true (otherwise this method do nothing):
force is true, or
The underlying image has no sinks.
This safety check helps to prevent the disposal of an image that still used in a JAI operation chain. It doesn't prevent the disposal in every cases however. When unsure about whatever a coverage is still in use or not, it is safer to not invoke this method and rely on the garbage collector instead.
Overrides:
dispose in class AbstractCoverage
Parameters:
force - true for forcing an inconditionnal disposal, or false for performing a conservative disposal. The recommanded value is false.
Returns:
true if this method disposed at least some resources, or false if this method vetoed against the disposal.
Since:
2.4
See Also:
PlanarImage.dispose()回答 1
Stack Overflow用户
回答已采纳
发布于 2022-02-25 07:56:33
修改代码
public static void main(String[] args) throws Exception {
File file = new File("E:\\test\\1\\昂多.tif");
GridCoverage2D read = null;
GeoTiffReader reader = null;
try (FileInputStream is = new FileInputStream(file)){
reader = new GeoTiffReader(is);
read = reader.read(null);
Envelope2D coverageEnvelope = read.getEnvelope2D();
Rectangle2D bounds2D = coverageEnvelope.getBounds2D();
double[] bbox = {
bounds2D.getMinX(), bounds2D.getMinY(),
bounds2D.getMaxX(), bounds2D.getMaxY()
};
for (double v : bbox) {
System.out.println(v);
}
}finally {
read.dispose(true);
reader.dispose();
FileUtils.forceDelete(file);
}
}代码运行结果
98.408460773
30.078745248
98.460743439
30.115231446
Process finished with exit code 0GeoTiffReader构造方法接受inputStream，因此这个输入流由我控制以关闭。
if (this.source instanceof InputStream || this.source instanceof ImageInputStream) {
this.closeMe = false;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/70705253
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